212021102011021 has 4 divisors (see below), whose sum is σ = 212033543850844. Its totient is φ = 212008660171200.

The previous prime is 212021102011013. The next prime is 212021102011073. The reversal of 212021102011021 is 120110201120212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 163427460015625 + 48593641995396 = 12783875^2 + 6970914^2 .

It is a cyclic number.

It is not a de Polignac number, because 212021102011021 - 2³ = 212021102011013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212021102010986 and 212021102011004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212021102012021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6220894350 + ... + 6220928431.

It is an arithmetic number, because the mean of its divisors is an integer number (53008385962711).

Almost surely, 2^{212021102011021} is an apocalyptic number.

It is an amenable number.

212021102011021 is a deficient number, since it is larger than the sum of its proper divisors (12441839823).

212021102011021 is a wasteful number, since it uses less digits than its factorization.

212021102011021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12441839822.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 212021102011021 its reverse (120110201120212), we get a palindrome (332131303131233).

The spelling of 212021102011021 in words is "two hundred twelve trillion, twenty-one billion, one hundred two million, eleven thousand, twenty-one".